Seat frame



FIG. 1 is a perspective view of a seat frame in accordance with the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof, a right side elevational view being a mirror image thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a front perspective view of an alternative embodiment of the new design having indeterminate width.

The broken lines in the figures are for illustration purposes only and form no part of the claimed invention. 

The ornamental design for a seat frame, as shown and described. 